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CVE-2026-64496— iio: event: Fix event FIFO reset race

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.15版本存在安全漏洞，该漏洞源于事件FIFO重置竞态问题，可能导致越界读取并泄露相邻内核内存。

CVSS 7.1 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b91accafbb1031b80d22ad83576877ff2f8b4774< 9dc84ba4be5bbeb29ee49efe6cea2cb32c461424 affected
b91accafbb1031b80d22ad83576877ff2f8b4774< d16a702ca7d29c0b7a9b509339d1b044a1cadb32 affected
b91accafbb1031b80d22ad83576877ff2f8b4774< a13ef1adbc62085b21b546b07b0be7e2fbf52150 affected
b91accafbb1031b80d22ad83576877ff2f8b4774< 0d4a646d7f87ea3625fafe387043fddc6a2f5e7f affected
b91accafbb1031b80d22ad83576877ff2f8b4774< 72c6aa8e0d74eab91b8694cde97dec088c248fee affected
b91accafbb1031b80d22ad83576877ff2f8b4774< 9edefd4c56bee3fe331e0355d1f10a533134999d affected
b91accafbb1031b80d22ad83576877ff2f8b4774< f187dc5a4c4846ffa07d9bda6e760837ed005574 affected
b91accafbb1031b80d22ad83576877ff2f8b4774< af791d295737ea6b6ff2c8d8488462a49c14af01 affected
… +10 more rows
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I. Basic Information for CVE-2026-64496

Vulnerability Information
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Vulnerability Title
iio: event: Fix event FIFO reset race
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: iio: event: Fix event FIFO reset race `iio_event_getfd()` creates the event file descriptor with `anon_inode_getfd()`, which allocates a new fd, creates the anonymous file and installs it in the process fd table before returning to the caller. The IIO code resets the event FIFO after `anon_inode_getfd()` has returned, but before `IIO_GET_EVENT_FD_IOCTL` has copied the fd number to userspace. But since fd tables are shared between threads, another thread can guess the newly allocated fd number and issue a `read()` on it as soon as the fd has been installed. This means the `kfifo_to_user()` in `iio_event_chrdev_read()` can run in parallel with the `kfifo_reset_out()` in `iio_event_getfd()`. The kfifo documentation says that `kfifo_reset_out()` is only safe when it is called from the reader thread and there is only one concurrent reader. Otherwise it is dangerous and must be handled in the same way as `kfifo_reset()`. If that happens, `kfifo_to_user()` can advance the FIFO `out` index based on state from before the reset, after the reset has already moved the `out` index to the current `in` index. That can leave the FIFO with an `out` index past the `in` index. A later `read()` can then see an underflowed FIFO length and copy more data than the event FIFO buffer contains. This can result in an out-of-bounds read and leak adjacent kernel memory to userspace. Move the FIFO reset before `anon_inode_getfd()`. At that point the event fd is marked busy, but the new fd has not been installed yet, so userspace cannot access it while the FIFO is reset.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.15版本存在安全漏洞，该漏洞源于事件FIFO重置竞态问题，可能导致越界读取并泄露相邻内核内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b91accafbb1031b80d22ad83576877ff2f8b4774 ~ 9dc84ba4be5bbeb29ee49efe6cea2cb32c461424 -
Linux Linux 3.15 -

II. Public POCs for CVE-2026-64496

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III. Intelligence Information for CVE-2026-64496

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Patches & Fixes for CVE-2026-64496 (8)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64450 9.1 CRITICAL tipc: fix out-of-bounds read in broadcast Gap ACK blocks
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64496

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